Tooth.



L. E. EVSLIN.

TOOTH.

APPLICATION FILED MAY2.1010.

Patented Dec. 15. 1914.

Witnesses PATENT @FFEQE LEO E. EVSLIN, OF N. v YORK, N. Y., AQSIGI-TQRTO THE UNIVERSAL INTEBCHANGE- ABLE TODTH COMPANY, OF PEOR-IA, ILLINOIS,A CORPORATION OF ILLINOIS.

TOOTH.

Specification of Letters Patent.

Patented Dec. 15, 1914.

Application filed May 2, 1910. Serial No. 553,998.

T all 107mm it may concern Be t known that I, Luo E. Evsnrx, a subjectof the Emperor of Russia, residing at New York, in the county of NewYork and State of New York, have invented certain new and u fulImprovements in Teeth, of which the i'ollov-Jing is a specification.

This invention has reference to artificial teeth, and has for its objectto improve the interior construction of the tooth and the tongue and b"king for the same, whereby interchange-a7 y is assured, and also toprovid for the grindii'ig or cutting down of long teeth to insureuniversal application of teeth of the same kind.

A further object of the invention is to improve the anterior est-heticteeth in a manner which will provide for an all porcelain bite,resembling in appearance the anterior plate teeth used for vulcanite.vork.

In the accompanying drawings, I have illustrated the preferred manner ofcarrying out my invention. Therein the several views are as follows:

Figure 1 is a perspective view oi a tooth, showing the flared extensionoi the tongue protruding from the groove in the posterior face; Fig. 9,is a sectional view of a tooth, ha *ing a tongue within its groove; Fig.3 is a perspective view of a tongue and its flared extension.

Like numerals of reference denote corresponding parts throughout thefigures.

1 denotes the tooth havi' g the labial sur face 2 and the posteriorsurface The posterior surface 3 at the rubber line is formed with ashoulder or effect -l and from there the posterior surface inclinesdownwardly and inwardly producing the sloping posterior surface 5, withan offset or shoulder 6, from which point the angle of the posteriorsurface changes, as at 7, terminating in the cervical border 8.

The tooth is provided with a groove 9, the main portion of which ispreferably dovetail in cross-section leading from the posterior surfaceto the inclined portion 5 thereof, toward the bucal cusp, and saiddovetail portion of the groove is lined with a metallic boxing or lining10. The dovetail portion of the groove communicates with a flaredportion or opening 1%, which in width is no wider than the narrowestportion of the dovetail portion and opens out of the posterior surfaceof the tooth. The under masticating wall 15, which is a continuation ofthe inner end of the dovetail portion of the groove and the flaredportion is of sinuous formation, having the inclined portion 16 and theconcave portion 17 uniting in the offset or shoulder 18, said oiiset orshoulder being provided to receive an extension of the tongue and theconcave portion receiving the convex edge oi the flared portion of thetongue.

The construction of the under masticating wall of the groove, in mannerdescribed, is for the purpose of lodging the extension of the tongue,increase the etl'iciency of the masticatinp' surface of the tooth, whichis considerably weakened by the use of a straight under masticatingwall, and which also enables me to obtain a broader attachment for thebacking, such broader attachment being required to make the tooth ofuniversal application, with teeth of the same kind, which is to say, along tooth can be ground to any desired shape at the cervical border forits adjustment to the gum or to the crown. The tongue includes the wedgeshaped body portion 19 conforming to the dovetail portion of the groovein the tooth and boxing therein and is provided with a flared wing orearlike portion 20 having a rounded or convex edge 21, starting at oneend of the wedge portion and extending beyond the same and stoppingshort of the other end of said we ige portion, as at 22, leaving theextension 523 of the tongue above referred to. The beveled sides of thetongue portion 19 and the side faces of the flared wing or ear-likeportion 20 are milled or serrated as at 24, to provide adhering surfacesfor the cement, and especially are the flared wing or earlike extensionmilled or serrated, so that in the preliminary attaching and shaping ofthe backing to the backing of the tooth, the hard-wax applied to securethe extension to the backing will more readily adhere to the extensionand thereby the tongue and backing be more readily removed preparatoryto securing the backing to crowns, abutments, etc.

lVhat I claim is:

1. In combination, a tooth having a sloping face between the rubber lineshoulder and the shoulder near the cervical border, said tooth having adovetail groove leading in from said sloping face and connecting with aflared opening, the under masticating Wall partially bordering saidgroove and flared opening consisting of an inclined portion and aconcave portion uniting in an &- set, for the purposes described. 5 2.In combination, a tooth having a sloping face between the rubber lineshoulder and the shoulder near the cervical border, said tooth having adovetail groove leading in from said sloping face and connecting with aflared opening, the under inasticating Wall partially bordering saidgroove and flared opening consisting of an inclined portion and aconcave portion uniting in an off- Copies of this patent may be obtainedfor five cents each, by addressing the Washington, D. 0.

set, a tongue for the tooth having a Wedge shape portion adapted to fitin the dovetail groove, edgewise from the narrow edge of the Wedge shapeportion and adapted to fit in said flared opening and project fromWithout the posterior surface of the tooth.

In testimony whereof I affix my signature, in presence of two Witnesses.

LEO E. EVSLIN. Witnesses:

GEORGE Orrin, ROBERT PLOWE.

Commissioner of Patents,

and a flared extension projecting

